Idaho County Maps
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Ada County, Idaho
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Ada County, Idaho Map
An detailed map of Ada County. Click on a nearby County to view more information about that County.
Map of Counties in Idaho
An interactive map of Counties in Idaho. Click on a County to view more information about that County.
About Ada County, Idaho
Ada County is located in the southwestern part of Idaho, United States. As of the 2020 census, the county had a population of 494,967, which by 2022 was estimated to have risen to 518,907. Ada County is by far the state's most populous county; it is home to 26.8% of the state's population. The county seat and largest city is Boise, which is also the state capital. Ada County is included in the Boise metropolitan area. The Ada County Highway District has jurisdiction over all the local county and city streets, except for private roads and state roads. In the interior Pacific Northwest east of the Cascade Range, Ada County ranks second in population, behind Spokane County, Washington.
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This site has an interactive map of Idaho Counties. Click on the map to find your Idaho county, and view more details. You can also search for your address and use your GPS to find your Idaho County.
Find what County you are in, and see official Idaho County resources and information. Find any county in the United Stated, along with resources and links to official County websites. See a County map and local details. Looking for what county you are currently in? Find out on this map or use your device GPS to see what county you are in.